Human colon cancer tissues are more sensitive than rectal cancer tissues to antitumor drugs in vitro.

Abstract:

:The chemosensitivities of 62 human colon cancer tissues, 67 rectal cancer tissues and 31 tumor-adjacent normal mucosal tissues were determined using the in vitro succinate dehydrogenase inhibition (SDI) test. These tissues obtained at the time of surgery were exposed to carboquone (CQ), adriamycin (ADM), mitomycin C (MMC), aclacinomycin A (ACR), cisplatin (DDP) and 5-fluorouracil (5-FU). The chemosensitivity was considered as positive when succinate dehydrogenase (SD) activity of the drug-treated cells decreased to below 50% of that of control cells, on day 3 of exposure. Decrease in the SD activity was noted in the colon cancer tissues, compared to the rectal cancer tissues, exposed to six antitumor drugs and in particular, to CQ (p less than 0.05), DDP (p less than 0.01) and ACR (p less than 0.05, one-sided paired t test). Decrease in the SD activity was noted in the tumor tissues, compared to the tumor-adjacent normal tissues, exposed to CQ, MMC and ACR (p less than 0.01). The sensitive rates were higher in the colon cancer tissues than the rectal cancer tissues, against all six antitumor drugs. Our findings show that the rectal cancer tissues are resistant to antitumor drugs, compared to the colon cancer tissues in vitro. When selecting antitumor drugs to treat patients with a rectal cancer, the assessment for chemosensitivity of the related tissues is crucial.

journal_name

Oncology

journal_title

Oncology

authors

Ueo H,Maehara Y,Saito A,Sakaguchi Y,Kohnoe S,Sugimachi K

doi

10.1159/000226917

subject

Has Abstract

pub_date

1991-01-01 00:00:00

pages

158-61

issue

2

eissn

0030-2414

issn

1423-0232

journal_volume

48

pub_type

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